@article{VM_2006_8_1_a5,
     author = {Robert J. Krawczyk},
     title = {Fermat's {Spiral} {Mandalas}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2006_8_1_a5/}
}